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Date: Wed, 8 Jul 2009 19:11:09 +0200
From: Karsten Keil <keil@...systems.de>
To: linux-kernel@...r.kernel.org
Cc: netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
i4ldeveloper@...tserv.isdn4linux.de
Subject: [PATCH 02/13] ISDN: Clean up isdnhdlc code
Clean up isdnhdlc to meet current code standard.
Remove hint to already removed bit reversal table.
Signed-off-by: Karsten Keil <keil@...systems.de>
---
drivers/isdn/i4l/isdnhdlc.c | 366 +++++++++++++++++++++++--------------------
include/linux/isdn/hdlc.h | 68 +++++----
2 files changed, 231 insertions(+), 203 deletions(-)
diff --git a/drivers/isdn/i4l/isdnhdlc.c b/drivers/isdn/i4l/isdnhdlc.c
index 44ec741..b80e55a 100644
--- a/drivers/isdn/i4l/isdnhdlc.c
+++ b/drivers/isdn/i4l/isdnhdlc.c
@@ -1,23 +1,24 @@
/*
* isdnhdlc.c -- General purpose ISDN HDLC decoder.
*
- *Copyright (C) 2002 Wolfgang Mües <wolfgang@...w-muees.de>
- * 2001 Frode Isaksen <fisaksen@...an.com>
- * 2001 Kai Germaschewski <kai.germaschewski@....de>
+ * Copyright (C)
+ * 2002 Wolfgang Mües <wolfgang@...w-muees.de>
+ * 2001 Frode Isaksen <fisaksen@...an.com>
+ * 2001 Kai Germaschewski <kai.germaschewski@....de>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
@@ -36,20 +37,20 @@ MODULE_LICENSE("GPL");
/*-------------------------------------------------------------------*/
enum {
- HDLC_FAST_IDLE,HDLC_GET_FLAG_B0,HDLC_GETFLAG_B1A6,HDLC_GETFLAG_B7,
- HDLC_GET_DATA,HDLC_FAST_FLAG
+ HDLC_FAST_IDLE, HDLC_GET_FLAG_B0, HDLC_GETFLAG_B1A6, HDLC_GETFLAG_B7,
+ HDLC_GET_DATA, HDLC_FAST_FLAG
};
enum {
- HDLC_SEND_DATA,HDLC_SEND_CRC1,HDLC_SEND_FAST_FLAG,
- HDLC_SEND_FIRST_FLAG,HDLC_SEND_CRC2,HDLC_SEND_CLOSING_FLAG,
- HDLC_SEND_IDLE1,HDLC_SEND_FAST_IDLE,HDLC_SENDFLAG_B0,
- HDLC_SENDFLAG_B1A6,HDLC_SENDFLAG_B7,STOPPED
+ HDLC_SEND_DATA, HDLC_SEND_CRC1, HDLC_SEND_FAST_FLAG,
+ HDLC_SEND_FIRST_FLAG, HDLC_SEND_CRC2, HDLC_SEND_CLOSING_FLAG,
+ HDLC_SEND_IDLE1, HDLC_SEND_FAST_IDLE, HDLC_SENDFLAG_B0,
+ HDLC_SENDFLAG_B1A6, HDLC_SENDFLAG_B7, STOPPED
};
-void isdnhdlc_rcv_init (struct isdnhdlc_vars *hdlc, int do_adapt56)
+void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, int do_adapt56)
{
- hdlc->bit_shift = 0;
+ hdlc->bit_shift = 0;
hdlc->hdlc_bits1 = 0;
hdlc->data_bits = 0;
hdlc->ffbit_shift = 0;
@@ -63,10 +64,12 @@ void isdnhdlc_rcv_init (struct isdnhdlc_vars *hdlc, int do_adapt56)
hdlc->ffvalue = 0;
hdlc->dstpos = 0;
}
+EXPORT_SYMBOL(isdnhdlc_out_init);
-void isdnhdlc_out_init (struct isdnhdlc_vars *hdlc, int is_d_channel, int do_adapt56)
+void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, int is_d_channel,
+ int do_adapt56)
{
- hdlc->bit_shift = 0;
+ hdlc->bit_shift = 0;
hdlc->hdlc_bits1 = 0;
hdlc->data_bits = 0;
hdlc->ffbit_shift = 0;
@@ -83,7 +86,7 @@ void isdnhdlc_out_init (struct isdnhdlc_vars *hdlc, int is_d_channel, int do_ada
}
hdlc->cbin = 0x7e;
hdlc->bit_shift = 0;
- if(do_adapt56){
+ if (do_adapt56) {
hdlc->do_adapt56 = 1;
hdlc->data_bits = 0;
hdlc->state = HDLC_SENDFLAG_B0;
@@ -93,6 +96,25 @@ void isdnhdlc_out_init (struct isdnhdlc_vars *hdlc, int is_d_channel, int do_ada
}
hdlc->shift_reg = 0;
}
+EXPORT_SYMBOL(isdnhdlc_rcv_init);
+
+static int
+check_frame(struct isdnhdlc_vars *hdlc)
+{
+ int status;
+
+ if (hdlc->dstpos < 2) /* too small - framing error */
+ status = -HDLC_FRAMING_ERROR;
+ else if (hdlc->crc != 0xf0b8) /* crc error */
+ status = -HDLC_CRC_ERROR;
+ else {
+ /* remove CRC */
+ hdlc->dstpos -= 2;
+ /* good frame */
+ status = hdlc->dstpos;
+ }
+ return status;
+}
/*
isdnhdlc_decode - decodes HDLC frames from a transparent bit stream.
@@ -121,40 +143,63 @@ void isdnhdlc_out_init (struct isdnhdlc_vars *hdlc, int is_d_channel, int do_ada
returns - number of decoded bytes in the destination buffer and status
flag.
*/
-int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src,
- int slen, int *count, unsigned char *dst, int dsize)
+int isdnhdlc_decode(struct isdnhdlc_vars *hdlc, const u8 *src, int slen,
+ int *count, u8 *dst, int dsize)
{
- int status=0;
+ int status = 0;
- static const unsigned char fast_flag[]={
- 0x00,0x00,0x00,0x20,0x30,0x38,0x3c,0x3e,0x3f
+ static const unsigned char fast_flag[] = {
+ 0x00, 0x00, 0x00, 0x20, 0x30, 0x38, 0x3c, 0x3e, 0x3f
};
- static const unsigned char fast_flag_value[]={
- 0x00,0x7e,0xfc,0xf9,0xf3,0xe7,0xcf,0x9f,0x3f
+ static const unsigned char fast_flag_value[] = {
+ 0x00, 0x7e, 0xfc, 0xf9, 0xf3, 0xe7, 0xcf, 0x9f, 0x3f
};
- static const unsigned char fast_abort[]={
- 0x00,0x00,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff
+ static const unsigned char fast_abort[] = {
+ 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
};
+#define handle_fast_flag(h) \
+ do {\
+ if (h->cbin == fast_flag[h->bit_shift]) {\
+ h->ffvalue = fast_flag_value[h->bit_shift];\
+ h->state = HDLC_FAST_FLAG;\
+ h->ffbit_shift = h->bit_shift;\
+ h->bit_shift = 1;\
+ } else {\
+ h->state = HDLC_GET_DATA;\
+ h->data_received = 0;\
+ } \
+ } while (0)
+
+#define handle_abort(h) \
+ do {\
+ h->shift_reg = fast_abort[h->ffbit_shift - 1];\
+ h->hdlc_bits1 = h->ffbit_shift - 2;\
+ if (h->hdlc_bits1 < 0)\
+ h->hdlc_bits1 = 0;\
+ h->data_bits = h->ffbit_shift - 1;\
+ h->state = HDLC_GET_DATA;\
+ h->data_received = 0;\
+ } while (0)
+
*count = slen;
- while(slen > 0){
- if(hdlc->bit_shift==0){
+ while (slen > 0) {
+ if (hdlc->bit_shift == 0) {
hdlc->cbin = *src++;
slen--;
hdlc->bit_shift = 8;
- if(hdlc->do_adapt56){
- hdlc->bit_shift --;
- }
+ if (hdlc->do_adapt56)
+ hdlc->bit_shift--;
}
- switch(hdlc->state){
+ switch (hdlc->state) {
case STOPPED:
return 0;
case HDLC_FAST_IDLE:
- if(hdlc->cbin == 0xff){
+ if (hdlc->cbin == 0xff) {
hdlc->bit_shift = 0;
break;
}
@@ -163,32 +208,30 @@ int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src,
hdlc->bit_shift = 8;
break;
case HDLC_GET_FLAG_B0:
- if(!(hdlc->cbin & 0x80)) {
+ if (!(hdlc->cbin & 0x80)) {
hdlc->state = HDLC_GETFLAG_B1A6;
hdlc->hdlc_bits1 = 0;
} else {
- if(!hdlc->do_adapt56){
- if(++hdlc->hdlc_bits1 >=8 ) if(hdlc->bit_shift==1)
+ if ((!hdlc->do_adapt56) &&
+ (++hdlc->hdlc_bits1 >= 8) &&
+ (hdlc->bit_shift == 1))
hdlc->state = HDLC_FAST_IDLE;
- }
}
- hdlc->cbin<<=1;
- hdlc->bit_shift --;
+ hdlc->cbin <<= 1;
+ hdlc->bit_shift--;
break;
case HDLC_GETFLAG_B1A6:
- if(hdlc->cbin & 0x80){
+ if (hdlc->cbin & 0x80) {
hdlc->hdlc_bits1++;
- if(hdlc->hdlc_bits1==6){
+ if (hdlc->hdlc_bits1 == 6)
hdlc->state = HDLC_GETFLAG_B7;
- }
- } else {
+ } else
hdlc->hdlc_bits1 = 0;
- }
- hdlc->cbin<<=1;
- hdlc->bit_shift --;
+ hdlc->cbin <<= 1;
+ hdlc->bit_shift--;
break;
case HDLC_GETFLAG_B7:
- if(hdlc->cbin & 0x80) {
+ if (hdlc->cbin & 0x80) {
hdlc->state = HDLC_GET_FLAG_B0;
} else {
hdlc->state = HDLC_GET_DATA;
@@ -198,74 +241,55 @@ int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src,
hdlc->data_bits = 0;
hdlc->data_received = 0;
}
- hdlc->cbin<<=1;
- hdlc->bit_shift --;
+ hdlc->cbin <<= 1;
+ hdlc->bit_shift--;
break;
case HDLC_GET_DATA:
- if(hdlc->cbin & 0x80){
+ if (hdlc->cbin & 0x80) {
hdlc->hdlc_bits1++;
- switch(hdlc->hdlc_bits1){
+ switch (hdlc->hdlc_bits1) {
case 6:
break;
case 7:
- if(hdlc->data_received) {
- // bad frame
+ if (hdlc->data_received)
+ /* bad frame */
status = -HDLC_FRAMING_ERROR;
- }
- if(!hdlc->do_adapt56){
- if(hdlc->cbin==fast_abort[hdlc->bit_shift+1]){
- hdlc->state = HDLC_FAST_IDLE;
- hdlc->bit_shift=1;
+ if (!hdlc->do_adapt56) {
+ if (hdlc->cbin == fast_abort
+ [hdlc->bit_shift + 1]) {
+ hdlc->state =
+ HDLC_FAST_IDLE;
+ hdlc->bit_shift = 1;
break;
}
- } else {
+ } else
hdlc->state = HDLC_GET_FLAG_B0;
- }
break;
default:
- hdlc->shift_reg>>=1;
+ hdlc->shift_reg >>= 1;
hdlc->shift_reg |= 0x80;
hdlc->data_bits++;
break;
}
} else {
- switch(hdlc->hdlc_bits1){
+ switch (hdlc->hdlc_bits1) {
case 5:
break;
case 6:
- if(hdlc->data_received){
- if (hdlc->dstpos < 2) {
- status = -HDLC_FRAMING_ERROR;
- } else if (hdlc->crc != 0xf0b8){
- // crc error
- status = -HDLC_CRC_ERROR;
- } else {
- // remove CRC
- hdlc->dstpos -= 2;
- // good frame
- status = hdlc->dstpos;
- }
- }
+ if (hdlc->data_received)
+ status = check_frame(hdlc);
hdlc->crc = 0xffff;
hdlc->shift_reg = 0;
hdlc->data_bits = 0;
- if(!hdlc->do_adapt56){
- if(hdlc->cbin==fast_flag[hdlc->bit_shift]){
- hdlc->ffvalue = fast_flag_value[hdlc->bit_shift];
- hdlc->state = HDLC_FAST_FLAG;
- hdlc->ffbit_shift = hdlc->bit_shift;
- hdlc->bit_shift = 1;
- } else {
- hdlc->state = HDLC_GET_DATA;
- hdlc->data_received = 0;
- }
- } else {
+ if (!hdlc->do_adapt56)
+ handle_fast_flag(hdlc);
+ else {
hdlc->state = HDLC_GET_DATA;
hdlc->data_received = 0;
}
break;
default:
- hdlc->shift_reg>>=1;
+ hdlc->shift_reg >>= 1;
hdlc->data_bits++;
break;
}
@@ -278,16 +302,17 @@ int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src,
hdlc->bit_shift--;
return status;
}
- if(hdlc->data_bits==8){
+ if (hdlc->data_bits == 8) {
hdlc->data_bits = 0;
hdlc->data_received = 1;
- hdlc->crc = crc_ccitt_byte(hdlc->crc, hdlc->shift_reg);
+ hdlc->crc = crc_ccitt_byte(hdlc->crc,
+ hdlc->shift_reg);
- // good byte received
- if (hdlc->dstpos < dsize) {
+ /* good byte received */
+ if (hdlc->dstpos < dsize)
dst[hdlc->dstpos++] = hdlc->shift_reg;
- } else {
- // frame too long
+ else {
+ /* frame too long */
status = -HDLC_LENGTH_ERROR;
hdlc->dstpos = 0;
}
@@ -296,24 +321,18 @@ int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src,
hdlc->bit_shift--;
break;
case HDLC_FAST_FLAG:
- if(hdlc->cbin==hdlc->ffvalue){
+ if (hdlc->cbin == hdlc->ffvalue) {
hdlc->bit_shift = 0;
break;
} else {
- if(hdlc->cbin == 0xff){
+ if (hdlc->cbin == 0xff) {
hdlc->state = HDLC_FAST_IDLE;
- hdlc->bit_shift=0;
- } else if(hdlc->ffbit_shift==8){
+ hdlc->bit_shift = 0;
+ } else if (hdlc->ffbit_shift == 8) {
hdlc->state = HDLC_GETFLAG_B7;
break;
- } else {
- hdlc->shift_reg = fast_abort[hdlc->ffbit_shift-1];
- hdlc->hdlc_bits1 = hdlc->ffbit_shift-2;
- if(hdlc->hdlc_bits1<0)hdlc->hdlc_bits1 = 0;
- hdlc->data_bits = hdlc->ffbit_shift-1;
- hdlc->state = HDLC_GET_DATA;
- hdlc->data_received = 0;
- }
+ } else
+ handle_abort(hdlc);
}
break;
default:
@@ -323,7 +342,7 @@ int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src,
*count -= slen;
return 0;
}
-
+EXPORT_SYMBOL(isdnhdlc_decode);
/*
isdnhdlc_encode - encodes HDLC frames to a transparent bit stream.
@@ -343,12 +362,11 @@ int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src,
dsize - destination buffer size
returns - number of encoded bytes in the destination buffer
*/
-int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
- unsigned short slen, int *count,
- unsigned char *dst, int dsize)
+int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src, u16 slen,
+ int *count, u8 *dst, int dsize)
{
static const unsigned char xfast_flag_value[] = {
- 0x7e,0x3f,0x9f,0xcf,0xe7,0xf3,0xf9,0xfc,0x7e
+ 0x7e, 0x3f, 0x9f, 0xcf, 0xe7, 0xf3, 0xf9, 0xfc, 0x7e
};
int len = 0;
@@ -356,31 +374,34 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
*count = slen;
while (dsize > 0) {
- if(hdlc->bit_shift==0){
- if(slen && !hdlc->do_closing){
+ if (hdlc->bit_shift == 0) {
+ if (slen && !hdlc->do_closing) {
hdlc->shift_reg = *src++;
slen--;
if (slen == 0)
- hdlc->do_closing = 1; /* closing sequence, CRC + flag(s) */
+ /* closing sequence, CRC + flag(s) */
+ hdlc->do_closing = 1;
hdlc->bit_shift = 8;
} else {
- if(hdlc->state == HDLC_SEND_DATA){
- if(hdlc->data_received){
+ if (hdlc->state == HDLC_SEND_DATA) {
+ if (hdlc->data_received) {
hdlc->state = HDLC_SEND_CRC1;
hdlc->crc ^= 0xffff;
hdlc->bit_shift = 8;
- hdlc->shift_reg = hdlc->crc & 0xff;
- } else if(!hdlc->do_adapt56){
- hdlc->state = HDLC_SEND_FAST_FLAG;
- } else {
- hdlc->state = HDLC_SENDFLAG_B0;
- }
+ hdlc->shift_reg =
+ hdlc->crc & 0xff;
+ } else if (!hdlc->do_adapt56)
+ hdlc->state =
+ HDLC_SEND_FAST_FLAG;
+ else
+ hdlc->state =
+ HDLC_SENDFLAG_B0;
}
}
}
- switch(hdlc->state){
+ switch (hdlc->state) {
case STOPPED:
while (dsize--)
*dst++ = 0xff;
@@ -388,14 +409,15 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
return dsize;
case HDLC_SEND_FAST_FLAG:
hdlc->do_closing = 0;
- if(slen == 0){
+ if (slen == 0) {
*dst++ = hdlc->ffvalue;
len++;
dsize--;
break;
}
- if(hdlc->bit_shift==8){
- hdlc->cbin = hdlc->ffvalue>>(8-hdlc->data_bits);
+ if (hdlc->bit_shift == 8) {
+ hdlc->cbin = hdlc->ffvalue >>
+ (8 - hdlc->data_bits);
hdlc->state = HDLC_SEND_DATA;
hdlc->crc = 0xffff;
hdlc->hdlc_bits1 = 0;
@@ -413,17 +435,17 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
hdlc->cbin <<= 1;
hdlc->data_bits++;
hdlc->cbin++;
- if(++hdlc->hdlc_bits1 == 6)
+ if (++hdlc->hdlc_bits1 == 6)
hdlc->state = HDLC_SENDFLAG_B7;
break;
case HDLC_SENDFLAG_B7:
hdlc->cbin <<= 1;
hdlc->data_bits++;
- if(slen == 0){
+ if (slen == 0) {
hdlc->state = HDLC_SENDFLAG_B0;
break;
}
- if(hdlc->bit_shift==8){
+ if (hdlc->bit_shift == 8) {
hdlc->state = HDLC_SEND_DATA;
hdlc->crc = 0xffff;
hdlc->hdlc_bits1 = 0;
@@ -432,7 +454,7 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
break;
case HDLC_SEND_FIRST_FLAG:
hdlc->data_received = 1;
- if(hdlc->data_bits==8){
+ if (hdlc->data_bits == 8) {
hdlc->state = HDLC_SEND_DATA;
hdlc->crc = 0xffff;
hdlc->hdlc_bits1 = 0;
@@ -440,11 +462,11 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
}
hdlc->cbin <<= 1;
hdlc->data_bits++;
- if(hdlc->shift_reg & 0x01)
+ if (hdlc->shift_reg & 0x01)
hdlc->cbin++;
hdlc->shift_reg >>= 1;
hdlc->bit_shift--;
- if(hdlc->bit_shift==0){
+ if (hdlc->bit_shift == 0) {
hdlc->state = HDLC_SEND_DATA;
hdlc->crc = 0xffff;
hdlc->hdlc_bits1 = 0;
@@ -453,14 +475,14 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
case HDLC_SEND_DATA:
hdlc->cbin <<= 1;
hdlc->data_bits++;
- if(hdlc->hdlc_bits1 == 5){
+ if (hdlc->hdlc_bits1 == 5) {
hdlc->hdlc_bits1 = 0;
break;
}
- if(hdlc->bit_shift==8){
- hdlc->crc = crc_ccitt_byte(hdlc->crc, hdlc->shift_reg);
- }
- if(hdlc->shift_reg & 0x01){
+ if (hdlc->bit_shift == 8)
+ hdlc->crc = crc_ccitt_byte(hdlc->crc,
+ hdlc->shift_reg);
+ if (hdlc->shift_reg & 0x01) {
hdlc->hdlc_bits1++;
hdlc->cbin++;
hdlc->shift_reg >>= 1;
@@ -474,11 +496,11 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
case HDLC_SEND_CRC1:
hdlc->cbin <<= 1;
hdlc->data_bits++;
- if(hdlc->hdlc_bits1 == 5){
+ if (hdlc->hdlc_bits1 == 5) {
hdlc->hdlc_bits1 = 0;
break;
}
- if(hdlc->shift_reg & 0x01){
+ if (hdlc->shift_reg & 0x01) {
hdlc->hdlc_bits1++;
hdlc->cbin++;
hdlc->shift_reg >>= 1;
@@ -488,7 +510,7 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
hdlc->shift_reg >>= 1;
hdlc->bit_shift--;
}
- if(hdlc->bit_shift==0){
+ if (hdlc->bit_shift == 0) {
hdlc->shift_reg = (hdlc->crc >> 8);
hdlc->state = HDLC_SEND_CRC2;
hdlc->bit_shift = 8;
@@ -497,11 +519,11 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
case HDLC_SEND_CRC2:
hdlc->cbin <<= 1;
hdlc->data_bits++;
- if(hdlc->hdlc_bits1 == 5){
+ if (hdlc->hdlc_bits1 == 5) {
hdlc->hdlc_bits1 = 0;
break;
}
- if(hdlc->shift_reg & 0x01){
+ if (hdlc->shift_reg & 0x01) {
hdlc->hdlc_bits1++;
hdlc->cbin++;
hdlc->shift_reg >>= 1;
@@ -511,7 +533,7 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
hdlc->shift_reg >>= 1;
hdlc->bit_shift--;
}
- if(hdlc->bit_shift==0){
+ if (hdlc->bit_shift == 0) {
hdlc->shift_reg = 0x7e;
hdlc->state = HDLC_SEND_CLOSING_FLAG;
hdlc->bit_shift = 8;
@@ -520,33 +542,36 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
case HDLC_SEND_CLOSING_FLAG:
hdlc->cbin <<= 1;
hdlc->data_bits++;
- if(hdlc->hdlc_bits1 == 5){
+ if (hdlc->hdlc_bits1 == 5) {
hdlc->hdlc_bits1 = 0;
break;
}
- if(hdlc->shift_reg & 0x01){
+ if (hdlc->shift_reg & 0x01)
hdlc->cbin++;
- }
hdlc->shift_reg >>= 1;
hdlc->bit_shift--;
- if(hdlc->bit_shift==0){
- hdlc->ffvalue = xfast_flag_value[hdlc->data_bits];
- if(hdlc->dchannel){
+ if (hdlc->bit_shift == 0) {
+ hdlc->ffvalue =
+ xfast_flag_value[hdlc->data_bits];
+ if (hdlc->dchannel) {
hdlc->ffvalue = 0x7e;
hdlc->state = HDLC_SEND_IDLE1;
hdlc->bit_shift = 8-hdlc->data_bits;
- if(hdlc->bit_shift==0)
- hdlc->state = HDLC_SEND_FAST_IDLE;
+ if (hdlc->bit_shift == 0)
+ hdlc->state =
+ HDLC_SEND_FAST_IDLE;
} else {
- if(!hdlc->do_adapt56){
- hdlc->state = HDLC_SEND_FAST_FLAG;
+ if (!hdlc->do_adapt56) {
+ hdlc->state =
+ HDLC_SEND_FAST_FLAG;
hdlc->data_received = 0;
} else {
hdlc->state = HDLC_SENDFLAG_B0;
hdlc->data_received = 0;
}
- // Finished with this frame, send flags
- if (dsize > 1) dsize = 1;
+ /* Finished this frame, send flags */
+ if (dsize > 1)
+ dsize = 1;
}
}
break;
@@ -556,7 +581,7 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
hdlc->cbin++;
hdlc->data_bits++;
hdlc->bit_shift--;
- if(hdlc->bit_shift==0){
+ if (hdlc->bit_shift == 0) {
hdlc->state = HDLC_SEND_FAST_IDLE;
hdlc->bit_shift = 0;
}
@@ -565,12 +590,13 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
hdlc->do_closing = 0;
hdlc->cbin = 0xff;
hdlc->data_bits = 8;
- if(hdlc->bit_shift == 8){
+ if (hdlc->bit_shift == 8) {
hdlc->cbin = 0x7e;
hdlc->state = HDLC_SEND_FIRST_FLAG;
} else {
*dst++ = hdlc->cbin;
- hdlc->bit_shift = hdlc->data_bits = 0;
+ hdlc->bit_shift = 0;
+ hdlc->data_bits = 0;
len++;
dsize = 0;
}
@@ -578,14 +604,14 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
default:
break;
}
- if(hdlc->do_adapt56){
- if(hdlc->data_bits==7){
+ if (hdlc->do_adapt56) {
+ if (hdlc->data_bits == 7) {
hdlc->cbin <<= 1;
hdlc->cbin++;
hdlc->data_bits++;
}
}
- if(hdlc->data_bits==8){
+ if (hdlc->data_bits == 8) {
*dst++ = hdlc->cbin;
hdlc->data_bits = 0;
len++;
@@ -596,8 +622,4 @@ int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const unsigned char *src,
return len;
}
-
-EXPORT_SYMBOL(isdnhdlc_rcv_init);
-EXPORT_SYMBOL(isdnhdlc_decode);
-EXPORT_SYMBOL(isdnhdlc_out_init);
EXPORT_SYMBOL(isdnhdlc_encode);
diff --git a/include/linux/isdn/hdlc.h b/include/linux/isdn/hdlc.h
index cf0a95a..8f3540c 100644
--- a/include/linux/isdn/hdlc.h
+++ b/include/linux/isdn/hdlc.h
@@ -1,27 +1,28 @@
/*
- * isdnhdlc.h -- General purpose ISDN HDLC decoder.
+ * hdlc.h -- General purpose ISDN HDLC decoder.
*
* Implementation of a HDLC decoder/encoder in software.
* Neccessary because some ISDN devices don't have HDLC
- * controllers. Also included: a bit reversal table.
+ * controllers.
*
- *Copyright (C) 2002 Wolfgang Mües <wolfgang@...w-muees.de>
- * 2001 Frode Isaksen <fisaksen@...an.com>
- * 2001 Kai Germaschewski <kai.germaschewski@....de>
+ * Copyright (C)
+ * 2002 Wolfgang Mües <wolfgang@...w-muees.de>
+ * 2001 Frode Isaksen <fisaksen@...an.com>
+ * 2001 Kai Germaschewski <kai.germaschewski@....de>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ISDNHDLC_H__
@@ -31,20 +32,24 @@ struct isdnhdlc_vars {
int bit_shift;
int hdlc_bits1;
int data_bits;
- int ffbit_shift; // encoding only
+ int ffbit_shift; /* encoding only */
int state;
int dstpos;
- unsigned short crc;
+ u16 crc;
- unsigned char cbin;
- unsigned char shift_reg;
- unsigned char ffvalue;
+ u8 cbin;
+ u8 shift_reg;
+ u8 ffvalue;
- unsigned int data_received:1; // set if transferring data
- unsigned int dchannel:1; // set if D channel (send idle instead of flags)
- unsigned int do_adapt56:1; // set if 56K adaptation
- unsigned int do_closing:1; // set if in closing phase (need to send CRC + flag
+ /* set if transferring data */
+ u32 data_received:1;
+ /* set if D channel (send idle instead of flags) */
+ u32 dchannel:1;
+ /* set if 56K adaptation */
+ u32 do_adapt56:1;
+ /* set if in closing phase (need to send CRC + flag) */
+ u32 do_closing:1;
};
@@ -57,14 +62,15 @@ struct isdnhdlc_vars {
#define HDLC_CRC_ERROR 2
#define HDLC_LENGTH_ERROR 3
-extern void isdnhdlc_rcv_init (struct isdnhdlc_vars *hdlc, int do_adapt56);
+extern void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, int do_adapt56);
-extern int isdnhdlc_decode (struct isdnhdlc_vars *hdlc, const unsigned char *src, int slen,int *count,
- unsigned char *dst, int dsize);
+extern int isdnhdlc_decode(struct isdnhdlc_vars *hdlc, const u8 *src,
+ int slen, int *count, u8 *dst, int dsize);
-extern void isdnhdlc_out_init (struct isdnhdlc_vars *hdlc,int is_d_channel,int do_adapt56);
+extern void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, int is_d_channel,
+ int do_adapt56);
-extern int isdnhdlc_encode (struct isdnhdlc_vars *hdlc,const unsigned char *src,unsigned short slen,int *count,
- unsigned char *dst,int dsize);
+extern int isdnhdlc_encode(struct isdnhdlc_vars *hdlc, const u8 *src,
+ u16 slen, int *count, u8 *dst, int dsize);
#endif /* __ISDNHDLC_H__ */
--
1.6.0.2
--
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